Watchcase.



No. 778,251. y PATENTED DEC. 27, 1904. A. M. KILBERG. WATGHCASE.

APPLICATION FILED JULY 9, 1904.

v @ww/4410i @mmf M Patented December 27, 1904.

PATENT OEEICE.

ALBERT M. KILBERG, OF SGRANTON, PENNSYLVANIA.

WATCHCASE.

SPECIFICATION forming part of Letters Patent No. 778,251, dated December 27, 1904.

Application filed July 9, 1904. Serial No. 215,930.

To LZ whom it may concern.-

Be it known that I, ALBERT l/I. KILBERG, of Scranton, in the county of Lackawanna, State of Pennsylvania, have invented certain new and useful Improved Watch .Tamb-Clamps; and I hereby declare the following to be a full, clear, and exact description ot the same, reference being had to the accompanying drawings, forming a part of this speciiication, and to the letters or' reference marked thereon.

The object of this invention is to provide an improved means for securing the works ot' a watch in the case whereby not only will the frame or movement plates and case-center mutually support each other1 but the connecting means will distribute the strains uniformly and at the same time retain the movement securely without liability of accidentally becoming loosened.

A further object of the invention is to provide a movemcnt-securing means which will not weaken either the movement-plates or case and which may be used in connection with very thin movements and cases without increasing the thickness.

Referring to the accompanying drawings, Figure l is a section through a watch with the wheel-train omitted and showing the application oi' the present invention. Fig. 2 is a section through the jamb-clamp alone. Fig. 3 is a plan view of the jamb-clamp. Fig. 4 is an elevation of a modified form oi' the jambclamp. Fig. 5 is a perspective view showing one mode ot' applying or removing the jambclamp.

Like letters of reference in the several ligures indicate the same parts.

The watchcase-center is indicated by the letter A, the top plate of the movement by the letter B, and the bottom plate of the movement by the letter C. The case-center A is provided with a seat, preferably annular, for the rim of the bottom plate ot' the movement, as indicated at-D, and the rim at the back side of the center is formed with an annular seat for cooperation with the movement-securing device, which I shall term a.jamb-elamp.7 This jamb-clamp (indicated by the letterE in the accompanying drawings) is preferably in the form oi' a ring, the periphery oi' which is formed to seat on the rim of the case-center, while its inner diameter is threaded, as at e, for engaging a corresponding thread on the periphery of the top plate of the movement. The inner edge of the rim and the periphery of the jamb-clamp are preferably formed on a corresponding taper or bevel to form a conical seat and bearing, as at f; but it is obvious that the jamb-clamp may be formed with a flange or shoulder f', vFig'. 2, to take a bearing on the outer side of the rim.

In securing the parts together the movement is putin place trom the front of the case` and the iamb-clamp is screwed onto the top plate of the movement, said clamp being turned until it takes a `iirm bearing around the entire rim ot the case, thereby drawing the movement lirmly into the ease and holding' it by a uniform pressure front and back.

The i'ace of the jamb-clamp is preferably made to lie substantially iiush with the top plate, so as to present a neat appearance and to permit of the watch being made thin and light. For convenience it may be provided with small holes 71 for the insertion of the points oi' a wrench or other instrument,where by it may be readily turned into place or removedwas shown, for instance, in Fig. 5.

Obviously the watchcase may be ot' the hunting-case type or ot' any other type so far as the present invention is concerned, and it is also obvious that the jarnb-clamp may itself form a dust-guard by being closed in on one side, as indicated at l, Fig. 4, and such dustguard may, as usual, be provided with a glass or crystal, should it be desired, to permit inspection of the movement without opening the same to the air.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-4 1. The combination with a watchcase-center having its rim provided with annular seats and a movement having a bottom plate with a peripheral bearing cooperating with the seat on one rim and a top plate, oi' an annular jamb-clamp threaded onto the edge o' the top plate of the movement and taking a bearing on the annulur seat of the other rim of the case-center; substantially as described.

IOO

2. The combination with a WateheaSe-eenand a movement seated in said center and haw me` its top plate threaded perpherally` of an annular jamb-elamp having' a peripheral tapering bearing for cooperation with tapering bearing of the rim and an internal thread for eoperation with the thread of the movementplate; substantially as described.

ALBERT M. KILBERG.

Witnesses:

XVM. Gr. LUNGAR, J. H. FRUTCHEY. 

